310531 33
Configuring the PrecisionFlo Module
Fig. 24
Kd + 100
Yes
Bead unstable?
Kd –100
Kd +20
No
Bead unstable?
No
Kd – 20
Yes
Done
Set Kd
From
Adjust
Kp
1
2
3
4
Adjust Kp and Kd Values Using an Oscilloscope
(continued)
Set Kd
(with an Oscilloscope)
Refer to the chart in Fig. 24 for more information. The
1
corresponds to the steps in this procedure.
1.
After you have adjusted Kp, examine the most
recent test pattern and see if it has any waves in it
after a change in bead width.
2.
If no waves exist, increase Kd by 100 and dis-
pense another test bead. Repeatedly increase Kd
and retest until a wave appears, after a width
change, to indicate unstable performance
(Fig. 20).
3.
Reduce Kd by 100 and resume adjusting upward
by increments of 20 and retesting until the wavi-
ness or instability appears again.
4.
Decrease Kd to the last previous setting.
5.
Disconnect the oscilloscope.
6.
Reconnect the electrical cable to the flow meter.
The adjustment procedure is complete and the module
is set for optimum performance with the current materi-
al and module configuration.
Using the Control Pendant to Modify Kp
and Kd Parameters
NOTE: Kp and Kd are control loop parameters which,
if changed incorrectly, could result in damage to the
module. These parameters should be changed by
qualified personnel only.
1.
On the control pendant:
HOME
SETUP
Protected Setup
2.
Key in the password, then press
[ENTER]
.
3.
Then go to:
PROTECTED SETUP
Modify PD/Vol Comp
4.
You see:
––MODIFY PD/VOL COMP––
Kp xxxx Kd xxxx
Vol Comp= xxx xx cts
Press F1 To Toggle
5.
Key in the Kp parameter, press
[ENTER]
, then
move the cursor to the Kd field. Key in Kd and
press
[ENTER]
.
6.
Press
[HOME]
to return to the HOME screen.
